1.The Message was brought to our shores during the life time of the Holy Prophet PBUH. This came in pure form, unadulterated by time or local cultures en-route. We have protected and nurtured Islam ever since. We rose against Akbar when he was dabbling with Din e Ilahi. Fakir Maznu Shah, Titu Mir, etc had led armed revolt against the English colonials as well as the Hindu zamindars. In the Jihad called by Shaheed Syed Ahmed or in the Khilafat movement we were in the forefront. We pioneered the Two Nation Theory giving birth to Pakistan. We have shed blood in the jihad against the infidels in Palestine, Afghanistan and Kashmir.
2. From a handful of Arab and semi Arab settlers who had accepted Islam, today we are one of the largest concentration of Muslims in the world. From Arakan in the east to Bihar in the west and N Nepal in the north is a dynamic and fast growing Muslim population. The rise of Hindu Brahmonic fundamentalism in the west and Buddhist supremacy in the east see us as mortal threat. They are not wrong. Islam is simple. It is pure. It is beautiful. It stands for justice, peace, temperance, love and equality. Obviously Hinu and Buddhist faiths would be concerned.
3. No, de-Islamization in BD is not going to happen. Rather the reverse is occurring. More and more are becoming Muslims in this region. Allh SWT be praised.